We have developed an electrochemical reactive oxygen/nitrogen species sensor that can detect superoxide anion radicals (O
2−•) and nitric oxide (NO). The reactive oxygen/nitrogen species sensor was fabricated by surface modification of an electrode with polymerized iron tetrakis(3-thienyl)porphyrin (FeT3ThP), and it can detect either O
2−• or NO by switching the applied potential. Furthermore, we fabricated a sensor with improved selectivity by coating a Nafion
® film onto the poly(FeT3ThP)-modified electrode. An interference current caused by NO
2− was seen for the poly(FeT3ThP)-modified electrode, while the interference current was significantly reduced at the Nafion
®/poly(FeT3ThP)-modified electrode, leading to improved selectivity for NO detection. The current response at the Nafion
®/poly(FeT3ThP)-modified electrode exhibited good linearity in the O
2−• and NO concentration ranges 1.3 – 4.1, and 0.5 – 10 μM, respectively. The Nafion
®/poly(FeT3ThP)-modified and poly(FeT3ThP)-modified electrodes are highly versatile, because these electrodes can detect either O
2−• or NO by switching the applied potential. Since the Nafion
®/poly(FeT3ThP)-modified and poly(FeT3ThP)-modified electrodes contain no bio-derived compounds, the reactive oxygen/nitrogen species sensor should be safe even when it is used
in vivo.
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